Abstract
At higher velocities, the helicopter tail transmission system encounters notable difficulties due to excessive bending vibrations. The shaft damping ring installed on the shaft system was shown to effectively suppress the shaft system vibrations. In this paper, the dynamic stiffness and damping characteristics of polyurethane shaft damping rings were studied using hyperelastic and viscoelastic constitutive models. The constitutive model and the damping ring material parameters were determined using uniaxial tensile and double-shear frequency scanning tests. Based on the test results, the dynamic damping ring characteristics were simulated and verified by dynamic stiffness tests; the influence of structural parameters and operating conditions on the dynamic stiffness and damping characteristics of the damping ring were obtained. The results provide a theoretical basis for the design of shaft systems with reduced sensitivity to vibrations.
Highlights
Hyperelastic Constitutive ModelWhen compared to the Mooney–Rivlin models, Yeoh models for elastic rubber material properties have a more accurate description, broader scope, and better describe the deformation at different ranges
In the field of aviation, the transmission shaft vibrations are mainly reduced through elastic supports [2], squeeze film dampers [3], dry-friction dampers [4], and viscoelastic damping rings [5], among others
E application of the viscoelastic damping ring in the tail drive shaft system can be traced back to the S-64 “Air Crane” helicopter first flown by Sikorsky company in 1962, in which similar damping devices were installed in the horizontal drive shaft [6]
Summary
When compared to the Mooney–Rivlin models, Yeoh models for elastic rubber material properties have a more accurate description, broader scope, and better describe the deformation at different ranges. According to the uniaxial tensile test data of polyurethane samples, the Mooney–Rivlin, Neo–Hookean, Yeoh, and Arruda Boyce models are fitted. Yeoh model shows a good fitting effect in the whole uniaxial tensile deformation range of polyurethane rubber specimens, primarily in the small and large deformation ranges. Rubber material behavior in the low (Yeoh model fitting curve expression “soft”) and high strain ranges differs as a result of C30 and C10, C20 orders of magnitude. Based on the previously presented results, the authors have selected the third-order Yeoh model as the hyperelastic constitutive model of shore 70 A polyurethane rubber material
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
